Automation Flashcards
What is an internal relay?
A computer generated device that has functions to control other devices
What is an internal timer?
A computer generated device that times in mS and can only be a on delay timer.
Internal counter?
Is a computer generated device that when an item or object passes through the device gets counted up and once reached a certain amount will perform a different function.
Pulse bit?
Is a computer generated device that will pulse and output and certain intervals to what it is set at.
What are the main 4 parts of a PLC?
Power supply
CPU (Central processing unit)
Input/Output Modules
Programming terminal
(5th is Rack)
What numbering system is based on 2 digits?
Binary
What numbering system is based on 8 digits? (0-7)
Octal
What numbering system is based on 10 digits?
Decimal
What numbering system is based on 16 digits
Hexadecimal
Which industry first used PLC’s?
Automotive industry
A PLC is a special kind of…?
Industrial computer
Most PLC’s are designed to be programmed in?
Ladder logic
A PLC power supply must be able to regulate voltage within?
5% of the required value
In a PLC all functions are performed by the?
CPU (Central Processing Unit)
Manufacturers use one of two devices to prevent a program from being accidentally deleted. What are they?
Software key and physical key
What is another name for the programming terminal?
Loading terminal
The PLCs terminal is used to?
a. Program the controller
b. Monitor the cpu and
c. Troubleshoot
Are NEMA symbols such as pushbuttons, limit switches or selector switches used in PLC ladder diagrams?
No. Only NO and NC contacts
How are contacts of a PLC ladder diagram addressed?
By a number/ contacts address
If a laptop or notebook computer were connected to a PLC the laptop or notebook computer would be referred to as the…
Programming terminal
In a ladder diagram each rung ends with a?
Coil
How are coils of a plc ladder diagram symbolized?
Brackets
What part of the PLC is referred to as the brains
CPU